Colour constancy refers to the stable perception of object colour under changing illumination conditions. This problem has been reformulated as relational colour constancy, or the ability of the observer to discriminate between material changes and changes in illumination. It has been suggested that local cone excitation ratios play a prominent role in achieving such constancy. Here we show tha...

The history of colour science has its origins in the era of Greek philosophers Plato and Aristotle. Newton, Helmholtz, Hering, Munsell, Land and Ostwald continued with the scientific approach as it was them who provided the basis for understanding and comprehension of the colour phenomena [1, 2, 3]. They proved that the perception of a colour will depend and change depending on the parameter ch...

Some animals, such as the chameleon and cephalopod, have the remarkable capability to change their skin colour. This unique characteristic has long inspired scientists to develop materials and devices to mimic such a function. However, it requires the complex integration of stretchability, colour-changing and tactile sensing. Here we show an all-solution processed chameleon-inspired stretchable...

Carotenoid-based colours are recognized as having an important signalling function, yet the nature of the mechanisms that maintain their honesty is not well understood. By combining a carotenoid-feeding experiment with a quantitative genetic experiment in a wild population of blue tits (Parus caeruleus), we were able to test predictions that differentiate between proposed mechanisms. If variati...

Fig. 1 Colour change of CO2-sensing pigment exposed to 100% CO2. A number of optical indicators have been developed in recent years to detect the presence of CO2 at different levels, depending on the desired application. The majority of CO2 indicators work via the change in pH which occurs when CO2 dissolves in water. A pH-sensitive dye, D , changes colour when it reacts with the protons genera...

The authors investigated the extent to which a change to an object’s colour is overtly prioritized for fixation relative to the appearance of a new object during real-world scene viewing. Both types of scene change captured gaze (and attention) when introduced during a fixation, although colour changes captured attention less often than new objects. Neither of these scene changes captured atten...

Ten colour emotional scales, namely, "Warm Cool", "Active-Passive", "Like-Dislike", "Clean-Dirty", "Fresh-Stale", "Modern-Classical", "Heavy-Light", "Hard- Soft", "Tense-Relaxed", and "Masculine-Feminine"are investigated for single-colour stimuli in CIELAB colour space within a psychophysical experiment by forty observers. The relationships between Iranian colour emotional responses and CIELAB ...